Análise mecanística de um pavimento de concreto utilizando elementos finitos

Abstract

Rigid pavements are basically large concrete slabs, joined by transfer bars and expansion joints, and are often used in situations where there is high flow, such as on Rodovia dos Bandeirantes (SP), via Anchieta (SP) and the BR 285. Although this is a highly durable solution on highways, it is known that it is not advantageous in the specific case of airport Runways, as the expansion joints cause discomfort in the running and landing processes. However, for quasi-static load regimes, this solution is widely used, as is the case of hangars and airport aprons, where aircraft are parked for long periods at pre-established points. In these cases, rigid pavements have greater durability compared to asphalt pavements. Therefore, the present work performs the computational mechanical modeling of rigid concrete pavements using the commercial finite element software Abaqus CAE. The load regime will be static, similar to the situation of a concrete pavement applied by an aircraft parked in a courtyard or in a hangar. At the beginning, a numerical simulation of the pavement is carried out considering the linear elastic materials (i.e., obeying Hooke's law). Subsequently, the Concrete Damage Plasticity model, implemented in ABAQUS, will be used to describe the non-linear behavior of concrete. This model will represent the two material failure mechanisms, i.e.: tension by crack opening and compression by crushing. Apply alternative materials, such as ultra-high-performance fiber reinforced concrete (UHPFRC). After this modeling, finally, the possible points of damage to the pavement are identified, which makes it possible to increase the structural safety of this type of component so expensive at airports.